21333033121 has 8 divisors (see below), whose sum is σ = 21857550624. Its totient is φ = 20808715680.

The previous prime is 21333033109. The next prime is 21333033173. The reversal of 21333033121 is 12133033312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21333033121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21333033092 and 21333033101.

It is not an unprimeable number, because it can be changed into a prime (21333033221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178546 + ... + 273028.

It is an arithmetic number, because the mean of its divisors is an integer number (2732193828).

Almost surely, 2^21333033121 is an apocalyptic number.

It is an amenable number.

21333033121 is a deficient number, since it is larger than the sum of its proper divisors (524517503).

21333033121 is an equidigital number, since it uses as much as digits as its factorization.

21333033121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100031.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21333033121 its reverse (12133033312), we get a palindrome (33466066433).

The spelling of 21333033121 in words is "twenty-one billion, three hundred thirty-three million, thirty-three thousand, one hundred twenty-one".